20031322121 has 4 divisors (see below), whose sum is σ = 20457520512. Its totient is φ = 19605123732.

The previous prime is 20031322099. The next prime is 20031322133. The reversal of 20031322121 is 12122313002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20031322121 is a prime.

It is a super-3 number, since 3×20031322121³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20031322121.

It is not an unprimeable number, because it can be changed into a prime (20031312121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213099125 + ... + 213099218.

It is an arithmetic number, because the mean of its divisors is an integer number (5114380128).

Almost surely, 2^20031322121 is an apocalyptic number.

It is an amenable number.

20031322121 is a deficient number, since it is larger than the sum of its proper divisors (426198391).

20031322121 is an equidigital number, since it uses as much as digits as its factorization.

20031322121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426198390.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20031322121 its reverse (12122313002), we get a palindrome (32153635123).

The spelling of 20031322121 in words is "twenty billion, thirty-one million, three hundred twenty-two thousand, one hundred twenty-one".